Drug allergy erythema multiforme: Difference between revisions
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==Overview== | ==Overview== | ||
Erythema multiforme is a skin condition of unknown etiology, but some authors suggest that the disease is mediated by deposition of immune complex (mostly [[IgM]]) in the superficial [[microvasculature]] of the skin and oral [[mucous membrane]] that usually follows an antecedent [[infection]] or [[drug exposure]]. It varies from a mild, self-limited [[rash]] (E. multiforme minor) to a severe, life-threatening form (E. multiforme major, or [[Stevens-Johnson syndrome]]) that also involves mucous membranes. | |||
===Common Causes=== | ===Common Causes=== | ||
The most common predisposing infection for E. multiforme is [[Herpes simplex]], but bacterial infections (commonly [[Mycoplasma]]) and fungal diseases are also implicated. E. multiforme may also be caused by drug reactions, most commonly [[sulfa drugs]], [[phenytoin]], [[barbiturates]], [[penicillin]], and [[allopurinol]], or a host of internal ailments. | The most common predisposing infection for E. multiforme is [[Herpes simplex]], but bacterial infections (commonly [[Mycoplasma]]) and fungal diseases are also implicated. E. multiforme may also be caused by drug reactions, most commonly [[sulfa drugs]], [[phenytoin]], [[barbiturates]], [[penicillin]], and [[allopurinol]], or a host of internal ailments. | ||
=== History and Symptoms === | === History and Symptoms === | ||
The skin form of E. multiforme, far more common than the severe form, usually presents with mildly itchy, pink-red blotches, symmetrically arranged and starting on the extremities. It often takes on the classical "target lesion" appearance, with a pink-red ring around a pale center. Resolution within 7-10 days is the norm. | The skin form of E. multiforme, far more common than the severe form, usually presents with mildly itchy, pink-red blotches, symmetrically arranged and starting on the extremities. It often takes on the classical "target lesion" appearance, with a pink-red ring around a pale center. Resolution within 7-10 days is the norm. | ||
=== | == Diagnosis == | ||
===Laboratory Findings=== | |||
Laboratory findings are non-specific and can include an elevated erythrocyte sedimentation rate ([[ESR]]), elevated white blood cell count ([[WBC]]), and elevated liver enzymes. | |||
Revision as of 18:54, 13 August 2012
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Overview
Erythema multiforme is a skin condition of unknown etiology, but some authors suggest that the disease is mediated by deposition of immune complex (mostly IgM) in the superficial microvasculature of the skin and oral mucous membrane that usually follows an antecedent infection or drug exposure. It varies from a mild, self-limited rash (E. multiforme minor) to a severe, life-threatening form (E. multiforme major, or Stevens-Johnson syndrome) that also involves mucous membranes.
Common Causes
The most common predisposing infection for E. multiforme is Herpes simplex, but bacterial infections (commonly Mycoplasma) and fungal diseases are also implicated. E. multiforme may also be caused by drug reactions, most commonly sulfa drugs, phenytoin, barbiturates, penicillin, and allopurinol, or a host of internal ailments.
History and Symptoms
The skin form of E. multiforme, far more common than the severe form, usually presents with mildly itchy, pink-red blotches, symmetrically arranged and starting on the extremities. It often takes on the classical "target lesion" appearance, with a pink-red ring around a pale center. Resolution within 7-10 days is the norm.
Diagnosis
Laboratory Findings
Laboratory findings are non-specific and can include an elevated erythrocyte sedimentation rate (ESR), elevated white blood cell count (WBC), and elevated liver enzymes.